JP3080565B2 - Electrode extraction structure for high-temperature secondary batteries - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode lead-out structure for electrically connecting the inside and outside of a container for accommodating a high-temperature secondary battery, and more particularly, to a structure in which a box-shaped container body which is opened upward is downward. The present invention relates to a structure for taking out electrodes in a vacuum insulated container having a structure in which a box-shaped lid having an opening is fitted.

[0002]

2. Description of the Related Art A high-temperature secondary battery, for example, a sodium-sulfur battery is usually operated at a temperature of 300 ° C. or higher. Therefore, as shown in FIG. Is disposed and accommodated in the metal box-shaped heat insulating container 0 of the above. The heat-insulating container 0 is formed of a double wall which can hold a heat insulating board and can maintain a vacuum degree of 0.1 Torr or less for a long period of time, and is designed to keep the internal high-temperature secondary battery warm and insulated. ing.
In the case of the heat-insulating container shown in FIG. 6, a structure in which a box-shaped lid body 2 opened downward is fitted over a box-shaped container main body 1 opened upward, and a side surface of the container main body is A bellows tube 9 through which an electrode terminal for extracting electric power from an internal battery penetrates, or a lead wire for supplying electric power to a heater (not shown) for heating the internal unit, or an internal temperature, voltage, and other conditions are measured. A bellows tube is provided through which a measurement lead wire is passed.

The bellows tube 9 used in such an application has a length of 40 to 60 mm and an inner diameter of 20 to 40 mm so as to keep the container airtight and withstand thermal expansion and contraction.
A special tube in which metal flanges are fixed to both ends of a stainless steel thin-walled elastic bellows having a diameter of about φ is used. At least three heat-insulating containers 0 penetrate the double wall, and the flanges are hermetically sealed inside and outside by welding. It is attached. Problems associated with the use of such a special bellows tube 9 are that the production of the heat insulating container is troublesome and costly, and the installation requires welding, so that the work requires skill and a strict airtightness test (leak test). In addition, there is a problem that heat loss occurs through the bellows tube portion, the temperature distribution of the battery group inside the container becomes uneven, and it is extremely difficult to replace the electrode terminals.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. The bellows tube itself is not required to reduce the cost, welding work is reduced, and the reliability of the heat insulating container is reduced. The purpose of the present invention is to provide an electrode extraction structure for high-temperature secondary batteries that can improve the operability, reduce heat loss, effectively use and reduce the volume of the container, and facilitate the work of replacing electrode terminals and lead wires. Is what you do.

[0005]

According to the present invention, there is provided a high-temperature secondary battery electrode extracting structure which solves the above-mentioned problems. In a heat insulating container fitted with a lid, the container extends from the inside of the container body to the outside along the upper end face of the side wall member, and then extends along the gap between the outer surface of the side wall member of the container body and the inner surface of the side wall member of the lid. And an electric conductor having an electrode terminal at a tip end thereof.

[0006]

Next, an embodiment of the present invention will be described with reference to FIGS. First, in FIG. 1, a sodium-sulfur battery 3 which is a high-temperature secondary battery is accommodated in a heat-insulating container 0 formed by fitting a box-shaped lid 2 opened downward on a box-shaped container main body 1 opened upward. ing.
The box-shaped container body 1 includes a side wall member 11 and a bottom member 1.
Both are made of a stainless steel case with a heat insulating board mounted inside, and are kept at a vacuum of 0.1 Torr or less. The box-shaped lid 2 is a side wall member 2 that can be fitted over the box-shaped container body 1 from above.
1 and a top plate member 22, each of which is a container body 1
The configuration is the same as in the above case.

The electrode take-out structure of the high-temperature secondary battery of the present invention in the mode shown in FIG. 1 (cross-sectional view) and FIG. 2 (perspective view) is applied to the heat-insulating container 1 described above, and the container main body is provided. 1 and a plurality of internal terminals 4 connected to the battery 3
1 is fixed to the inner terminal fixing bar 42 extending in a lateral direction, and the upper end surface of the side wall member 11 of the container body 1 and the top plate member 22 of the lid 2 are fixed to the inner terminal fixing bar 42. Along the gap between the inner surface of the container body 1 and the outer surface of the side wall member 11 of the container body 1 along the gap between the outer surface of the side wall member 21 of the lid 2. Strip-shaped bus plate 4 extending downward
3 and an electric conductor 4 having a round rod-shaped or pipe-shaped electrode terminal 44 disposed at the end of the bus plate 43.

As described above, the electric conductor 4 in the electrode extraction structure of the high-temperature secondary battery of the present invention comprises the container body 1 and the lid 2.
And electrically conductive between the inside and outside of the heat insulating container 0, so that the conventional complicated and expensive bellows tube 9 is used.
It is possible to reduce the cost and to omit the welding work required for the bellows tube, without using a pipe, so that a leak test becomes unnecessary and the reliability of the heat insulating container 0 can be improved. There are advantages.

The electric conductor 4 may be dent-fitted into the outer surface of the side wall member 11 of the container body 1 as shown in FIG. 1 or may be connected to the side wall member 11 of the container body 1 as shown in FIG. The straight member may be kept along the outer surface of the side wall member 11. If the shape of the dent corresponds to the bus plate 43 as the former structure, an extra gap between the box-shaped container main body 1 and the box-shaped lid 2 is eliminated, and a more compact structure can be obtained.

In the present invention, in addition to the above-described embodiments, the configuration can be embodied as follows. The cross-sectional area of the bus plate 43 or the electrode terminal 44 in the direction perpendicular to the current may be determined in consideration of the current load, mechanical strength, and the like, but the cross-sectional area of the bus plate 43 is equal to or larger than the electrode terminal 44. Is suitably 300% or less.
150% is preferred. Further, as the metal forming the electric conductor 4, a material having low reactivity with the active substance of the secondary battery housed therein, such as aluminum or an aluminum alloy, is particularly suitable, and a corrosive metal, for example, Copper and copper alloys are unsuitable in the present invention. The bus plate 43 has a thickness of 0.5 to 2.0.
An aluminum alloy thin plate of about mm can be used.

Further, as shown in FIG. 4, the bus plate 43 of the electric conductor 4 of the present invention is preferably covered with a heat-resistant electrically insulating coating layer 5 around the bus plate 43. With this coating layer 5, electrical insulation of the bus plate 43 can be easily ensured, and heat conduction of the internal heat can be suppressed by conducting the bus plate 43. As the coating layer 5 for this purpose, a mica tape is wound around the outer peripheral surface of the bus plate 43, a ceramic coating such as alumina is applied by thermal spraying or baking, or a ceramic thin plate, for example, having a thickness of 0.5 ~
A 1.0 mm mica plate may be stuck on the entire surface or housed in a mica plate case. In addition, as shown in FIG. 5, since it is inevitable that a certain gap is produced between the container body 1 and the lid 2 due to manufacturing tolerance, a heat insulating material is laminated to prevent heat loss. It is preferable to interpose a heat seal 6 formed by filling and filling. For this purpose, ceramic paper made from alumina fibers is suitable for reasons such as heat resistance, heat insulation, and ease of dimensional adjustment.

[0012]

The electrode take-out structure of the high-temperature secondary battery according to the present invention is constructed as described above. Therefore, in place of the bellows tube, the cost can be reduced, and the welding operation can be omitted. Can be improved in reliability. In addition, there is an excellent effect that heat loss can be reduced, the volume of the container can be effectively used and the size can be reduced, and the work of replacing electrode terminals and lead wires can be facilitated. Therefore, the present invention has an extremely high industrial value as an electrode extraction structure for a high-temperature secondary battery that solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an electric conductor of the present invention.

FIG. 3 is a partial cross-sectional view showing another embodiment.

FIG. 4 is a partial cross-sectional view showing another embodiment.

FIG. 5 is a partial cross-sectional view showing another embodiment.

FIG. 6 is a partial sectional view showing a conventional example.

[Explanation of symbols]

0 Insulated container, 1 container body, 11 side wall member, 2 lid, 21 side wall member, 3 battery, 4 electric conductor, 43
Bus plate, 44 electrode terminals, 5 coating layer, 6 heat seal, 9 bellows tube

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-266925 (JP, A) JP-A-6-231748 (JP, A) JP-A-6-290768 (JP, A) 17466 (JP, A) JP-A-7-245123 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 10/39 H01M 2/00-2/08

Claims (2)

(57) [Claims] 1. An insulated container comprising a box-shaped container body that opens upward and accommodates a high-temperature rechargeable battery, and a box-shaped lid body that is opened downward. , And extends downward along the gap between the outer surface of the side wall member of the container body and the inner surface of the side wall member of the lid, and is formed of an electric conductor having an electrode terminal at a tip end thereof. Electrode structure for high-temperature secondary batteries. 2. The electrode extraction structure for a high-temperature secondary battery according to claim 1, wherein the electric conductor is covered with a heat-resistant electric insulating coating layer.